CN112432674A - Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter - Google Patents
Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter Download PDFInfo
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- CN112432674A CN112432674A CN202011097690.9A CN202011097690A CN112432674A CN 112432674 A CN112432674 A CN 112432674A CN 202011097690 A CN202011097690 A CN 202011097690A CN 112432674 A CN112432674 A CN 112432674A
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- electromagnetic interference
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- electromagnetic shielding
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- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 9
- 230000003750 conditioning effect Effects 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/06—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission
- G01F1/075—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission with magnetic or electromagnetic coupling to the indicating device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/006—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus characterised by the use of a particular material, e.g. anti-corrosive material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/14—Casings, e.g. of special material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention belongs to the technical field of measuring instruments, and discloses an anti-electromagnetic interference sensor and an anti-electromagnetic interference turbine flowmeter, which comprise: the circuit comprises an internal circuit component, a shell without anti-electromagnetic interference characteristic, a shell with anti-electromagnetic interference characteristic and an electric connector; characterized in that the sensor further comprises: the electromagnetic shielding coating covers the surface of the shell without the anti-electromagnetic interference characteristic, the first elastic electromagnetic shielding component is arranged on the shell without the anti-electromagnetic interference characteristic and the shell contact surface with the anti-electromagnetic interference characteristic, and the second elastic electromagnetic shielding component is arranged on the electric connector and the shell contact surface with the anti-electromagnetic interference characteristic, so that the probability of sensor data distortion and false alarm applied to a complex electromagnetic environment is greatly reduced, and the electromagnetic shielding coating can be applied to an electronic pair strong electromagnetic interference environment.
Description
Technical Field
The invention belongs to the technical field of measuring instruments, and particularly relates to an anti-electromagnetic interference sensor and an anti-electromagnetic interference turbine flowmeter.
Background
In the prior art, the anti-electromagnetic interference method generally adopted by the sensor mainly comprises a metal housing shielding or circuit filtering mode.
The volume and the occupied area are increased by adopting a metal outer cover mode, and the method is not suitable for occasions with limited space; in the circuit design, a filtering mode is adopted, so that the protection problem of most of electromagnetic interference can be solved. However, since some sensors, such as a turbine flowmeter, etc., need to obtain signals in an electromagnetic induction manner, the shielding of the external electromagnetic interference in the full frequency domain cannot be performed, and the effect of the anti-electromagnetic interference design in a filtering manner is not obvious enough.
For the two-wire sensors commonly used in aircraft, the power supply and the signal are on the same two wires, which is more sensitive to external electromagnetic interference. When the electromagnetic interference is generated, the output signal generates large fluctuation, which can cause data distortion or cause false alarm. For some important devices, such as radar, these distortions and false positives are unacceptable.
Disclosure of Invention
The invention provides an anti-electromagnetic interference sensor and an anti-electromagnetic interference turbine flowmeter, which greatly reduce the probability of data distortion and false alarm of the sensor applied to a complex electromagnetic environment, and can be applied to an electronic pair equal-strength electromagnetic interference environment.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The first technical scheme is as follows:
an anti-electromagnetic interference sensor, the sensor comprising: the circuit comprises an internal circuit component, a shell without anti-electromagnetic interference characteristic, a shell with anti-electromagnetic interference characteristic and an electric connector; the sensor further comprises: the electromagnetic shielding device comprises an electromagnetic shielding coating which covers the surface of the shell without the characteristic of resisting electromagnetic interference, a first elastic electromagnetic shielding component which is arranged on the shell without the characteristic of resisting electromagnetic interference and a shell contact surface with the characteristic of resisting electromagnetic interference, and a second elastic electromagnetic shielding component which is arranged on the electrical connector and the shell contact surface with the characteristic of resisting electromagnetic interference.
The first technical scheme of the invention has the characteristics and further improvements that:
(1) the sensor further comprises: and a third elastic electromagnetic shielding component arranged in the interlayer of the shell with the anti-electromagnetic interference characteristic.
(2) The first elastic electromagnetic shielding component, the second elastic electromagnetic shielding component and the third elastic electromagnetic shielding component are respectively made of rubber filled with metal shielding materials.
The second technical scheme is as follows:
an anti-electromagnetic interference turbine flow meter, the turbine flow meter comprising: the device comprises a liquid flowing shell 1, a turbine 2, a coil 3, a pressing sleeve 4, a circuit board mounting shell 6, a circuit board mounting shell cover plate 7, a data processing and conditioning plate 8 and a socket 11; lead to between liquid shell 1 and the pressure cover 4 through threaded connection, turbine 2, coil 3, data processing set up inside circuit board installation shell 6 respectively with recuperating board 8, the turbine flowmeter still includes:
and the metal coating is arranged on the outer surface of the liquid passing shell 1 and provided with electromagnetic shielding.
The second technical scheme of the invention has the characteristics and further improvements that:
(1) the turbine flowmeter further comprises: a first elastic electromagnetic shielding ring 5, an elastic electromagnetic shielding gasket 10;
a first elastic electromagnetic shielding ring 5 is arranged on the contact surface of the pressing sleeve 4 and the circuit board mounting shell 6;
the contact surface of the circuit board mounting case 6 with the socket 11 is mounted with an elastic electromagnetic shield pad 10.
(2) The turbine flowmeter further comprises: a second elastic electromagnetic shielding ring 9;
and a second elastic electromagnetic shielding ring 9 is arranged on the contact surface of the circuit board mounting shell 6 and the circuit board mounting shell cover plate 7.
(3) The first elastic electromagnetic shielding ring 5, the second elastic electromagnetic shielding ring 9 and the elastic electromagnetic shielding pad 10 are respectively made of rubber filled with metal shielding materials.
(4) The metal coating with electromagnetic shielding, which is arranged on the outer surface of the liquid-passing shell 1, is a nickel coating.
The anti-electromagnetic interference design of the sensor provided by the invention starts from the mechanical aspect, and the anti-electromagnetic interference characteristic of the sensor is improved. Compared with the method through circuit design, the method has the advantages of low cost and high reliability; the anti-electromagnetic interference turbine flow sensor provided by the invention can be installed in the scene of early warning of complex electromagnetic environments such as airplanes and radars, and the like, and solves the problems of reduced precision, false alarm and the like of the existing turbine flow sensor in the strong electromagnetic interference environment.
Drawings
Fig. 1 is a schematic structural diagram of an anti-electromagnetic interference sensor according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an anti-electromagnetic interference turbine flowmeter according to an embodiment of the present invention;
wherein, a is an internal circuit component, b is a shell without anti-electromagnetic interference characteristic, c is an electromagnetic shielding coating, d is an elastic electromagnetic shielding component, e is an electric connector, and f is a shell with anti-electromagnetic interference characteristic;
1-liquid passing shell, 2-turbine, 3-coil, 4-pressing sleeve, 5-first elastic electromagnetic shielding ring, 6-circuit board mounting shell, 7-circuit board mounting shell cover plate, 8-data processing and conditioning plate, 9-second elastic electromagnetic shielding ring, 10-elastic electromagnetic shielding pad and 11-socket.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the detailed description.
When the common sensor is applied to a strong electromagnetic interference environment, the signal induction and processing component is exposed to an external electromagnetic environment probably because the metal shell does not have the electromagnetic shielding property; or the shell has electromagnetic shielding property, but the contact surface cannot be perfectly attached, so that external interference infiltration is caused. When exposed to full exposure or interference penetration, the sensor signal can produce fluctuations and even false alarms. Therefore, the anti-electromagnetic interference design of the sensor can shield the external interference by the metal matrix without electromagnetic shielding property in a plating mode; the elastic electromagnetic shielding component positioned on the contact surface of the component can effectively prevent electromagnetic interference from permeating from the contact surface, and the induction component and the processing circuit are protected, so that the problems of accuracy reduction and false alarm under the strong electromagnetic interference environment are solved.
The invention provides an anti-electromagnetic interference sensor, as shown in fig. 1, comprising: the electromagnetic shielding module comprises an internal circuit component a, a shell b without anti-electromagnetic interference characteristic, an electromagnetic shielding coating c, an elastic electromagnetic shielding component d, an electric connector e and a shell f with anti-electromagnetic interference characteristic.
The internal circuit component a comprises a sensitive component and a signal conditioning circuit; the surface of the shell b without the anti-electromagnetic interference characteristic is covered with an electromagnetic shielding coating layer c, so that the shell b without the anti-electromagnetic interference characteristic can obtain electromagnetic shielding performance; an elastic electromagnetic shielding member d is mounted on the contact surface of the connection portion between the housing b without anti-electromagnetic interference characteristic and the housing f and the electric connector e with anti-electromagnetic interference characteristic. The elastic electromagnetic shielding component d can be attached to each contact surface due to good elastic deformation capability, so that electromagnetic sealing of the connection part is realized. The electromagnetic shielding coating c, the elastic electromagnetic shielding component d, the electric connector e and the shell f with the anti-electromagnetic interference characteristic act independently or jointly to realize the isolation of the internal circuit component a from the external electromagnetic environment.
An embodiment of the present invention further provides an anti-electromagnetic interference turbine flow sensor, as shown in fig. 2, where the flow sensor includes: the device comprises a liquid flowing shell 1, a turbine 2, a magnetoelectric rotating speed device coil 3, a pressing sleeve 4, a first elastic electromagnetic shielding ring 5, a circuit board mounting shell 6, a circuit board mounting shell cover plate 7, a data processing and conditioning plate 8, a second elastic electromagnetic shielding ring 9, an elastic electromagnetic shielding pad 10 and a socket 11.
The outer surface of the liquid-passing shell 1 is provided with an electromagnetic shielding metal coating. The liquid-through shell 1 is connected with the pressing sleeve 4 through threads. The signal transmission between the magnetoelectric rotating speed device, namely the coil 3, and the data processing and conditioning plate 8, and between the data processing and conditioning plate 8 and the socket 11 adopts a flexible wire connection form. Elastic electromagnetic shielding components are arranged on the contact surface of the pressing sleeve 4 and the circuit board mounting shell 6, the contact surface of the circuit board mounting shell 6 and the circuit board mounting shell cover plate 7 and the contact surface of the circuit board mounting shell 6 and the socket 11. A complete shielding layer is constructed through a metal coating of the liquid flowing shell 1, the first elastic electromagnetic shielding ring 5, the second elastic electromagnetic shielding ring 9 and the elastic electromagnetic shielding pad 10, and the turbine 2, the magnetoelectric rotating speed device coil 3 and the data processing and conditioning plate 8 are isolated from the external electromagnetic environment.
The technical scheme of the invention comprises a metal coating with electromagnetic shielding property, and the contact part of each metal part is provided with an elastic electromagnetic shielding component. The metal coating can make the metal matrix which is not magnetic conductive have electromagnetic shielding property. The elastic electromagnetic shielding component can effectively complete the electromagnetic sealing of the contact surface. The metal coating and the elastic electromagnetic shielding component act independently to realize the electromagnetic isolation between the sensitive elements and circuits inside the sensor and the environment. The metal coating and the elastic electromagnetic shielding component act together to realize the electromagnetic isolation between the sensitive elements and circuits inside the sensor and the environment. The metal coating and the elastic electromagnetic shielding component can act together with other design methods to improve the anti-electromagnetic interference performance of the sensor.
The anti-electromagnetic interference design of the sensor provided by the invention starts from the mechanical aspect, and the anti-electromagnetic interference characteristic of the sensor is improved. Compared with the method through circuit design, the method has the advantages of low cost and high reliability; the anti-electromagnetic interference turbine flow sensor provided by the invention can be installed in the scene of early warning of complex electromagnetic environments such as airplanes and radars, and the like, and solves the problems of reduced precision, false alarm and the like of the existing turbine flow sensor in the strong electromagnetic interference environment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An anti-electromagnetic interference sensor, the sensor comprising: the circuit comprises an internal circuit component, a shell without anti-electromagnetic interference characteristic, a shell with anti-electromagnetic interference characteristic and an electric connector; characterized in that the sensor further comprises: the electromagnetic shielding device comprises an electromagnetic shielding coating which covers the surface of the shell without the characteristic of resisting electromagnetic interference, a first elastic electromagnetic shielding component which is arranged on the shell without the characteristic of resisting electromagnetic interference and a shell contact surface with the characteristic of resisting electromagnetic interference, and a second elastic electromagnetic shielding component which is arranged on the electrical connector and the shell contact surface with the characteristic of resisting electromagnetic interference.
2. The anti-electromagnetic interference sensor of claim 1, further comprising: and a third elastic electromagnetic shielding component arranged in the interlayer of the shell with the anti-electromagnetic interference characteristic.
3. The sensor of claim 2, wherein the first, second, and third elastic electromagnetic shielding members are made of rubber filled with metal shielding material.
4. An anti-electromagnetic interference turbine flow meter, the turbine flow meter comprising: the device comprises a liquid passing shell (1), a turbine (2), a coil (3), a pressing sleeve (4), a circuit board mounting shell (6), a circuit board mounting shell cover plate (7), a data processing and conditioning plate (8) and a socket (11); lead to between liquid shell (1) and the pressure cover (4) through threaded connection, turbine (2), coil (3), data processing set up inside circuit board installation shell (6) respectively with recuperating board (8), its characterized in that, turbine flowmeter still includes:
the metal coating with electromagnetic shielding is arranged on the outer surface of the liquid-passing shell (1).
5. The anti-electromagnetic interference turbine flow meter of claim 4, further comprising: a first elastic electromagnetic shielding ring (5) and an elastic electromagnetic shielding pad (10);
a first elastic electromagnetic shielding ring (5) is arranged on the contact surface of the pressing sleeve (4) and the circuit board mounting shell (6);
and an elastic electromagnetic shielding gasket (10) is arranged on the contact surface of the circuit board mounting shell (6) and the socket (11).
6. The anti-electromagnetic interference turbine flow meter of claim 5, further comprising: a second elastic electromagnetic shielding ring (9);
and a second elastic electromagnetic shielding ring (9) is arranged on the contact surface of the circuit board mounting shell (6) and the circuit board mounting shell cover plate (7).
7. The anti-electromagnetic interference turbine flowmeter as claimed in claim 6, wherein the first elastic electromagnetic shielding ring (5), the second elastic electromagnetic shielding ring (9) and the elastic electromagnetic shielding gasket (10) are made of rubber filled with metal shielding material.
8. The anti-electromagnetic interference turbine flowmeter as claimed in claim 4, characterized in that the metal coating with electromagnetic shielding provided on the outer surface of the liquid passing casing (1) is a nickel coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097690.9A CN112432674A (en) | 2020-10-14 | 2020-10-14 | Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011097690.9A CN112432674A (en) | 2020-10-14 | 2020-10-14 | Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN112432674A true CN112432674A (en) | 2021-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011097690.9A Pending CN112432674A (en) | 2020-10-14 | 2020-10-14 | Anti-electromagnetic interference sensor and anti-electromagnetic interference turbine flowmeter |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08101054A (en) * | 1994-09-29 | 1996-04-16 | Nippondenso Co Ltd | Flowmeter |
| CN2601814Y (en) * | 2003-02-21 | 2004-02-04 | 成都市依迈电子化工实业有限公司 | Conductive sealed pad |
| CN102980617A (en) * | 2012-12-21 | 2013-03-20 | 上海一诺仪表有限公司 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
| CN206556705U (en) * | 2017-03-02 | 2017-10-13 | 广州南控自动化设备有限公司 | A kind of low power consumption electromagnetic flowmeter |
| CN208059954U (en) * | 2018-02-24 | 2018-11-06 | 山东辰智电子科技有限公司 | A kind of electromagnetic flowmeter |
| CN213985229U (en) * | 2020-10-14 | 2021-08-17 | 中国航空工业集团公司北京长城航空测控技术研究所 | Anti-electromagnetic interference turbine flowmeter |
-
2020
- 2020-10-14 CN CN202011097690.9A patent/CN112432674A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08101054A (en) * | 1994-09-29 | 1996-04-16 | Nippondenso Co Ltd | Flowmeter |
| CN2601814Y (en) * | 2003-02-21 | 2004-02-04 | 成都市依迈电子化工实业有限公司 | Conductive sealed pad |
| CN102980617A (en) * | 2012-12-21 | 2013-03-20 | 上海一诺仪表有限公司 | Anti-high-frequency electromagnetic interference device for electromagnetic flow meter |
| CN206556705U (en) * | 2017-03-02 | 2017-10-13 | 广州南控自动化设备有限公司 | A kind of low power consumption electromagnetic flowmeter |
| CN208059954U (en) * | 2018-02-24 | 2018-11-06 | 山东辰智电子科技有限公司 | A kind of electromagnetic flowmeter |
| CN213985229U (en) * | 2020-10-14 | 2021-08-17 | 中国航空工业集团公司北京长城航空测控技术研究所 | Anti-electromagnetic interference turbine flowmeter |
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Application publication date: 20210302 |
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| RJ01 | Rejection of invention patent application after publication |